September in Escuintla is the rainiest, the cloudiest, and the coldest month of the year. In September, the weather in Escuintla is typically hot. Average daily high temperature in September is about 28 degrees above zero. On average, Escuintla has 28 rainy, 1 sunny, and 1 cloudy day in September. The rains are usually heavy. September as well as May, June, July, and August is considered the most uncomfortable time to visit Escuintla.